And make sure that qeema is pretty firmly pressed on the flat skewers, otherwise, a loosely put minced meat on the skewers will also fall apart. Some people add some extra fat in the ground beef or chicken so that it sticks better on the skewers.
Many people chop the hell out of onions and drain out all the water to make sure Qeema sticks on the skewers.
Some people also put the Qeema in a strainer type of pot and leave for a couple of hours so that all the water is drained before adding any other ingredient.
There are many, many recipes for different flavors, which is the easy part. The hardest part is not to let the kabab fall apart while grilling.
Also, make sure you grill on medium heat. A very high heat will quickly burn the meat from outside while it will remain someone uncooked from the inside.